Implant, Medical Implant, and Method for Delivery of a Medical Implant

ABSTRACT

An intravascular delivery device is disclosed comprising a delivery wire having a proximal and a distal end and an interior lumen extending there between and wherein said distal end comprises a connection interface adapted to matingly interlock with a proximal end portion of a medical implantable device, wherein said delivery device comprises a locking unit arranged to secure said connection interface in a locking position in which said medical implant is pivotably locked before a controlled release.

RELATED APPLICATIONS

This application is a continuation of and claims priority to U.S. patentapplication Ser. No. 13/264,728, filed Jan. 31, 2012, entitled Implant,Medical Implant, And Method For Delivery Of A Medical Implant, whichclaims priority to International Patent Application No.PCT/EP2010/056140, International Filing Date 6 May 2010, entitledImplant, Medical Implant, And Method For Delivery Of A Medical Implant,which claims priority to European Patent Application No. EP09158098.5filed 16 Apr. 2009 entitled Implant, Medical Implant, And Method ForDelivery Of A Medical Implant, and to European Patent Application No.EP09159586.8 filed 6 May 2009 entitled Implant, Medical Implant, AndMethod For Delivery Of A Medical Implant, all of which are herebyincorporated herein by reference in their entireties.

FIELD OF THE INVENTION

This invention pertains in general to the field of medical implants anddelivery devices for such implants, as well as methods for transluminaldelivery of medical devices into a body

BACKGROUND OF THE INVENTION

Various ways of deployment of a medical implants within a patient'scardiovascular system are known. However, known devices and methods havea number of drawbacks.

For instance WO 97/42878 discloses a medical implant having an end forthreadably attachment to a delivery wire. WO 2009/016265 of the sameapplicant as the present invention discloses a method for producing aconnection between two components of a medical implant which preferablyare composed of different materials which cannot be welded to oneanother is described. Furthermore, a medical implant which is producedaccording to the method is described. Moreover, the medical implantcomprises a connection interface whereon said medical implant isdetachable from an introduction wire or introduction implement. Theattachment to the introduction wire or introduction implement is alsobased on threaded attachment to an adapter that is put over e.g. awelded end of a bundle of wires of an implant.

Treaded attachment may in certain clinical situations not unlock insidethe body, when the implant is positioned. Consequently the implant hasto be removed from the body together with delivery wire. This increasesthe time of surgery and related costs unnecessarily. Also, patientsafety is reduced due to such unintended and undesired procedure.

Furthermore, the threaded attachment may loosen before implant is atfinal position and is unintentionally released in the patient's body.Loosening may for instance be initiated when the implant is collapsed ina catheter and the delivery wire is rotated during delivery relative asurrounding catheter. This may be done unintentionally by the humanfactor. Embolies may be caused by the loosened medical devicesuncontrollably released in the body.

Both above failures have dire consequences for the patient and thehealth care system. Patient risk is increased.

Also, when the medical device is released from the catheter, and stillattached to the threaded delivery wire, the medical implant is subjectto bending, relative the longitudinal axis of the delivery wire, atleast in certain anatomical positions, due to the nature of threadedattachment involving a directed bore and mating threads. This is forinstance the case in the heart where delivery is difficult, e.g.perpendicular to a septal wall having an opening to be closed by theimplant. This may affect the material of the device leading to fatigueof the device.

The implant is also affected by a force at release which eithertransposes through the medical implant and may then have a negativeimpact on the surrounding tissue or the medical implant inherently graspthe force and is affected as described above.

United States patent application 2003/0181945 (′145) discloses acoupling system that is disposed at the distal end of an interventionaldelivery system for coupling to an implant. The coupling device has afirst and second prong connected at one end. The other end of the prongsopen or close to release or trap an object, e.g., a bead tethered froman implant. A slot at the distal end of the coupling device allows extradegrees of flexibility for the coupling device. However, implantpivoting in a plane along the longitudinal axis of the coupling device”,according to '145 paragraph [0010]. Hence, the pivoting motion isrestricted to a single plane only and the degree of flexibility stillvery limited.

United States patent application 2003/045901 discloses another flexibledelivery system for a medical implant avoiding. The system has a wireformed from a plurality of layered strands yielding a reduced bendingstiffness for improved maneuverability with no reduction in overalltensile strength compared to delivery systems using a single wire and ofcomparable diameter. However, the system does neither allow for thedesired delivery flexibility mentioned above nor does it lock theimplant in relation the delivery device in a reliable manner. Theimplant may for instance move in longitudinal direction during deliverywhen manipulating the delivery catheter in relation to the implant.Exact delivery to a desired location may thus be complicated inpractice.

United States patent application US2004/176797 discloses a magneticattachment system which again raises locking issues as well as releaseissues as the implant may not be released from the magnetic connectionin a precise controlled manner in the patient's body. Moreoverflexibility in terms of a movement degree of freedom of the implantwhile attached to the delivery device is limited.

Also, a more flexible delivery is desired in terms of adjustments of thedevice used and applied methods, due to the fact that different patientsare anatomically slightly different to one another and that thedeficiency to be treated is most often individual and unique for eachpatient treated.

Thus, there is a need for a deployment device which adjusts fordifferences in the cardiovascular system between patients still allowinga secure deployment of a medical implant.

Hence, an improved delivery device or system and a method would beadvantageous. Also, a medical implant facilitating such improveddelivery would be advantageous.

Hence, an improved delivery device or system, medical implant, and amethod would be advantageous and in particular allowing for increasedflexibility, cost-effectiveness, and/or patient safety would beadvantageous.

SUMMARY OF THE INVENTION

Accordingly, embodiments of the present invention preferably seeks tomitigate, alleviate or eliminate one or more deficiencies, disadvantagesor issues in the art, such as the above-identified, singly or in anycombination by providing a device, aggregate, and a method according tothe appended patent claims.

Further embodiments of the invention are defined in the dependentclaims, wherein features for the second and subsequent aspects of theinvention are as for the first aspect mutatis mutandis.

More particularly the invention relates to an apparatus for deliveringof an occlusion device, and more particularly to intravascular deliverydevice for delivery of an occlusion device in the cardiovascular system.

Some embodiments of the invention provide for flexible delivery of amedical implant to anatomically difficult to reach sites in a body of ahuman or animal.

Some embodiments of the invention also provide for secure delivery of amedical implant.

The new delivery system allows significant improvements in producthandling. Before release of the occluder, the system allows a tiltedangle of up to approximately 45 degrees without any stress or pull onthe implant. Especially in challenging cases this feature has provenvital.

This allows the product to be placed in the final position without anyadverse pull from a delivery wire. The safe-handling attachment systemavoids any risk of unintended release during handling and allows a safepull back into the catheter should the implantation be interrupted.

It should be emphasized that the term “comprises/comprising” when usedin this specification is taken to specify the presence of statedfeatures, integers, steps or components but does not preclude thepresence or addition of one or more other features, integers, steps,components or groups thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects, features and advantages of which embodiments ofthe invention are capable of will be apparent and elucidated from thefollowing description of embodiments of the present invention, referencebeing made to the accompanying drawings, in which

FIG. 1 is assembly view of kit;

FIG. 2 is a rendered graphical composition;

FIG. 3 is a cross-sectional view of the device;

FIG. 4A is an illustration of the device in locked position;

FIG. 4B is an illustration of the device in a releasable position;

FIG. 5 is a schematic view of the distal tip in a locked position;

FIG. 6 is a schematic view of the distal tip in the releaseconfiguration;

FIG. 7 is a schematic view illustrating the principle of locking adetachable device used in an embodiment of the invention;

FIG. 8 is a schematic view of an interlocked device;

FIG. 9A is a schematic view illustrating another embodiment of theinvention of interlocking a medical implant;

FIG. 9B is a schematic view illustrating another embodiment of theinvention of interlocking a medical implant;

FIG. 9C is a schematic view illustrating another embodiment of theinvention of interlocking a medical implant;

FIG. 10A is a schematic view showing yet a further embodiment of theinvention of interlocking medical implant;

FIG. 10B is a schematic view showing yet a further embodiment of theinvention of interlocking medical implant;

FIG. 11A is a schematic view showing the flexibility in the jointbetween delivery catheter vs. medical implant;

FIG. 11B is a schematic view showing the flexibility in the jointbetween delivery catheter vs. medical implant;

FIG. 11C is a schematic view showing the flexibility in the jointbetween delivery catheter vs. medical implant;

FIG. 12 is an illustration of an end of a medical implantable device;

FIG. 13 is an illustration of a holding unit in various positionsbetween locking and release;

FIG. 14 is a perspective view of a proximal portion of a delivery devicehaving a resiliently flexible unit;

FIG. 15a is an illustration of a holding unit in release position;

FIG. 15b is an illustration of a holding unit in locking position;

FIG. 16 is a perspective view illustrating another embodiment of thedelivery device;

FIG. 17 is a perspective view illustrating another embodiment of thedelivery device;

FIG. 18 is a perspective view illustrating another embodiment of thedelivery device.

DESCRIPTION OF EMBODIMENTS

Specific embodiments of the invention now will be described withreference to the accompanying drawings. This invention may, however, beembodied in many different forms and should not be construed as limitedto the embodiments set forth herein; rather, these embodiments areprovided so that this disclosure will be thorough and complete, and willfully convey the scope of the invention to those skilled in the art. Theterminology used in the detailed description of the embodimentsillustrated in the accompanying drawings is not intended to be limitingof the invention. In the drawings, like numbers refer to like elements.

The following description focuses on an embodiment of the presentinvention applicable to a septal occluder. However, it will beappreciated that the invention is not limited to this application butmay be applied to many other medical implantable devices, including forexample filters, stents, left atrial appendage (LAA) occluders, aneurysmtreatment devices, grafts, etc.

An intravascular delivery device 1 comprises a delivery wire 100 havinga proximal 10 a and a distal end 10 b and an interior lumen 151extending there between (FIG. 3). The distal end 10 b comprises aconnection interface 140 adapted to matingly interlock with a proximalend portion 200 of a medical implantable device 2. The delivery devicecomprises a locking unit 110 arranged to secure the connection interfacein a locking position.

The medical device is thus pivotably locked before a controlled release.Pivotably locked means that the medical device is securely attached tothe distal end of the delivery device, while it still is able to move ina certain degree of freedom in relation to a longitudinal axis of thedistal end of the delivery device. The device is longitudinally locked,but pivotably movable in a radial plane in relation to the deliverydevice. A degree of freedom is for instance rotatable around thelongitudinal axis or tiltable in relation thereto, while beinglongitudinally locked in relation to the delivery device. This isdescribed in more detail below and allows for a precise yet flexibledelivery of the device to a desired target location.

In an embodiment, the intravascular delivery device comprises a lockingwire 150 arranged moveably within the lumen 151 of the delivery wire 100for relative longitudinal movement therein, the locking wire having adistal end comprising a holding structure 141, whereby the holdingstructure is axially moveable relative the delivery wire 100 between thelocking position (FIG. 15b ) at which the delivery wire encloses theholding structure and a second position at which the holding structureat least partly protrudes beyond the distal end of the delivery wire(FIG. 13, 15 a) such that the connection interface unlocks and themedical implantable device is controllably released.

In an embodiment, the medical implantable device is an occlusion devicefor occluding a selected site in a body. The medical implantable devicemay be collapsible or expandable, such as self expandable. The medicalimplantable device 2 may thus be advantageously and securely deliveredto a target site via a lumen of the body. At the target site, the deviceis moved forward out of the catheter, but still securely attached to thedelivery wire at the connection interface 140.

The occlusion device is for instance an ASD or PFO occluder for septalocclusion.

The occlusion device is for instance an atrial appendage occluder inother embodiments.

In this relation, for instance a first expanded diameter of the medicalimplantable device 2 may be positioned on a distal side of an opening ina wall, such as a septal or atrial wall. Then a second expanded diameterof the medical implantable device 2 may be positioned on a proximal sideof the opening in the wall. Thus the opening is reliable occluded whenthe device is grown into the tissue of the wall, e.g. byendothelisation.

Positioning in this anatomically demanding delivery application isfacilitated by the delivery device of the present embodiments.

However, the device has to be reliably released from the delivery device1. To this end, a locking unit 110 is unlocked. Here by threadedmovement from the locked position (FIG. 4A) to the unlocked position(FIG. 4B). Alternatively, or in addition to threaded locking, otherlocking units may be provided, such as a latch, spring latch, cap,cover, lid, seal, enclosure, etc. The internal locking wire 150 in thelumen may now be moved forward to push the holding unit 141 at theconnection interface out of a sleeve 150 thereof. As can be seen in FIG.9 for instance, the medical implantable device is now free for release.

During delivery, the medical implantable device 2, when expanded out ofthe catheter, and also during delivery inside the catheter is rotatablyfree and may pivot both axially and radially. This increases flexibilityduring delivery through narrow passages of the lumen for delivery. Inaddition, when expanded out of the catheter, but still movably locked tothe connection interface, the medical implantable device 2 may rotatefreely and pivot/tilt both axially and radially, see e.g. FIG. 10 or 11.This provides a large degree of flexibility during delivery andadaptation to different anatomical situations at the target site of themedical implantable device 2.

In an embodiment, the connection interface holding the medicalimplantable device provides for an axial flexibility such that themedical implantable device may tilt relative the longitudinal axis ofthe delivery device.

Tilting angles of approximately 45 degrees are thus obtainable.

In an embodiment, the holding structure 141 is provided radiallyenlarged to at least partly contact the interior lumen of the distal endof the delivery wire, see e.g. FIG. 13.

The holding structure may have a distal recess into which a bundle ofwires snugly fits. When the bundle of wires has a thickening, e.g. thespherically shaped end as shown in FIG. 12, it interlocks with theholding unit, once this is drawn into the sleeve 145.

Locking of the medical device 2 to the holding unit is provided by apositive fit which allows for a degree of free movement relative thedelivery wire when locked.

In an embodiment, the distal part of the holding structure 141 isbowl-shaped and has a recess in the edge of the bowl-shaped portion atthe distal end of the holding structure for receiving a portion of themedical implantable device. The recess may receive a neck of the medicalimplantable device. The bowl shaped portion, together with a welded clotat the proximal end 200 having a substantially spherical shape (FIG. 12)provides thus for the pivotal movement in an embodiment.

In an embodiment, the bowl-shaped recess is configured to enclose theproximal end portion of the medical implantable device at least partly.

Loading of the medical implantable device in to the delivery device andlocking at the connection interface is e.g. illustrated in FIGS. 7, 9and 10. The flexibly locked position is shown in FIG. 8.

In an embodiment, the intravascular delivery device comprises a controldevice connected to the proximal end of the delivery wire forcontrollably unlocking of the connection interface. Thus may beintegrated into a handle for convenient operation. The push operatingunit 130 may be operated to move the entire delivery wire with theinterlocked medical implantable device 2 at the distal end 10 b througha catheter (not shown). When at the target site, and the medicalimplantable device provided out of the distal end of the catheter, itmay be conveniently unlocked for detachment. Locking unit 110 isunlocked. A spring 115 provides a pre-load of the release operating unit120. The spring may be tensioned against a stop unit 112. Upon pushingagainst the spring load, the locking wire 150 is pushed in the distaldirection and the holding unit is moved out of the distal end 10 b. Thusthe medical implantable device is released and detached from thedelivery device 1.

In an embodiment, the control device is secured when the holdingstructure is in the locking position such that the control device has tobe manually operated to allow for the unlocking of the connectioninterface for controlled release of the medical implantable device fromthe delivery device, see FIGS. 4 A and B.

In an embodiment, a medical implantable device is provided having aproximal end portion adapted to matingly interlock with the connectioninterface. This is for instance the spherically welded clot of themedical implantable device 2 at the proximal end 200 thereof mating withthe spherical recess (bowl-shaped) in the holding unit 141.

FIG. 14 is a perspective view of a proximal portion of a delivery devicehaving a resiliently flexible unit 115 b. The resiliently flexible unitis for instance a disc. The resiliently flexible unit is for instancemade of rubber, silicone, or similar materials. Locking unit 110 b has abroadened proximal end, in order to provide a larger fitting area to theresiliently flexible unit 115 b.

The resiliently flexible unit 115 b provides for flexibility of thedelivery system even when the holding unit is in the locking position.In this manner, an axial flexibility may be provided when a medicaldevice is locked to the holder unit 141 at the connection interface 140.

Spring 115 provides for a pre-tension of the holding structure 141 insleeve of the connection interface 140 towards the locking position.This further enhances security of the delivery system. An unintentionalloosening of the medical device in the locked position is effectivelyavoided. Furthermore, when the medical device is positioned in theextended holding structure 141, the holding structure 141 is drawn backinto the sleeve of the connection interface 140 when the spindle orrelease operating unit 120 is released. By screwing the locking unit 110proximally, the connection interface is secured in the locking position.

The resiliently flexible unit 115 b provides in this locking positionseveral advantageous properties.

Firstly, a slight axial mobility is provided to the medical device whenit is securely locked to the holder unit 141 at the connection interface140. The axial movement is of course less than holder unit 141 movingout of the sleeve of the holding structure 141. The retracted lockingposition may also be provided so far in the sleeve of the holdingstructure 141 that this axial flexibility ends with the distal end ofthe holding structure 141 flush at the distal end 10 b, as shown in FIG.15 b.

Secondly, the entire delivery device is kept flexible during deliveryand a tension hardening of the flexible shaft 103. The flexible shaft iswound in form of a spiral. Bending of the flexible shaft is made at alarger radius than bending of the delivery wire 150 in the shaft 103.Forces may be extensive, which may damage the delivery instrument. Theresiliently flexible unit 115 b solves this issue by providingsufficient flexibility of the delivery device, in particular shaft 103and delivery wire 150 therein, while securely keeping the medical deviceattached to the delivery device.

FIGS. 16, 17 and 18 are perspective views illustrating anotherembodiment of the delivery device. In this embodiment, the holding unithas two longitudinal extensions 148, 149, each having a recess forreceiving a spherical end of a medical implantable device, asillustrated. The two longitudinal extensions 148, 149 provide for a slotbetween the recesses thereof. Loading of the medical device into thedelivery device is facilitated as the two recesses of the longitudinalextensions 148, 149 allow for insertion into the slot, and thewithdrawing the device into the holding unit 140 and locking theassembly. When the recesses of the two longitudinal extensions 148, 149are in form of a portion of a sphere, the proximal spherical end of themedical device may be clicked into the slot. It is then withheldtherein. Release upon delivery may be made against a counter forceprovided by the medical implant when anchored at the target site. Inaddition, the two longitudinal extensions 148, 149 may be provided toexpand with their distal ends radially outwardly. The radially outwardlyarrangement may be made resiliently. In this manner, the twolongitudinal extensions 148, 149 are brought together when drawn intothe holding unit 140. Upon pushing the longitudinal extensions 148, 149out of the holding unit, they radially expand and the slot is madelarger, thus releasing a medical implant when delivered. Loading of themedical implant maybe made by inserting the distal spherical end intothe slot, pushing the two longitudinal extensions 148, 149 together, andthus holding the implant securely in the spherical recess made up by therecesses in the longitudinal extensions 148, 149. Then drawing thepre-assembly into the holding unit 140 for locking therein is made in asmooth and advantageous way, further improving delivery security of themedical implant while maintaining flexibility of delivery.

In other examples the recesses may be cylindrical and release may thusbe made by moving the distal end of the implant sideways out of theslot.

In an embodiment, the medical implantable device comprises a bundle ofstrands or wires (see FIG. 12), wherein the bundle of strands of thedevice comprise a welded end having a welded proximal end portion,wherein the welded proximal end portion has defined proportions anddimensions configured as a connection interface adapted to matinglyinterlock with a holding structure. The medical implantable device maybe braided. The proximal end of the medical device has a bundle ofparallel strands ending in a welding clot. The welding clot beingspherical provides for the ease and flexibility of delivery when usingembodiments of the delivery device described herein.

In an embodiment, the connection interface of the medical implantabledevice has a generally spherical shape.

In embodiments, the connection interface allows for pivotal movementwhen locked.

In an embodiment, an assembly is provided comprising:

a delivery device 1 according to above, and

a medical implantable device 2 according to above, arranged in acatheter for intravascular delivery of the medical implantable device 2.

In an embodiment, the assembly comprises an intravascular deliverydevice comprising a delivery wire having a proximal and a distal end andan interior lumen extending there between and wherein the distal endcomprises a connection interface adapted to matingly interlock with aproximal end portion of a medical implantable device,

an internal wire extending within the lumen of the delivery wire whichis controllable for relative longitudinal movement from the proximal endof the delivery wire, the internal wire having a distal end that carriesa holding structure wherein the holding structure is axially moveablerelative the delivery wire from a first position at which the deliverywire encloses the holding structure whereby the connection interface isadapted to matingly interlock with the proximal end portion of themedical implantable device to a second position at which the holdingstructure at least partly protrudes beyond the distal end of thedelivery wire such that the connection interface unlocks and the medicalimplantable device is released;

a control device connected to the proximal end of the delivery wire;

a medical implantable device comprising a bundle of strands, the bundleof strands of the device comprising a welded end having a weldedproximal end portion, wherein the welded proximal end portion hasdefined proportions and dimensions configured as a connection interfaceadapted to matingly interlock with a holding structure, and;

wherein the medical implantable device is extendable from a relaxedcondition capable of assuming a convoluted condition, to an extended,linear condition in which the medical implantable device can be advancedthrough the lumen of the catheter.

In an embodiment, a method is provided for controlled delivery of themedical implantable device according to above at a selected site in abody vessel. The method comprises:

introducing a distal end of the above described assembly into a lumen ofthe body to a delivery site;

releasing the medical implantable device from the distal end of thecatheter by pushing the delivery wire distally;

controllably unlocking the medical implantable device from theconnection interface by operating the locking unit to unlock, and;

withdrawing the catheter and delivery wire from the body.

The medical implant may be made of a shape memory polymer material.

The medical implant may be made of metal, such as Nitinol.

The retention ball 200 is shaped from laser welded biocompatible Nitinolonly, using no other metals. In addition to reducing the amount ofmaterial implanted and giving a less traumatic tip, this gives severaladditional advantages. Most importantly, by not locking the strands atthe distal part into a rigid structure, the occluders remain moreflexible providing:

-   -   Superior adaptation to the septal tissue upon implantation    -   Superior adaptation to challenging anatomy    -   Sizing flexibility reducing the number of sizes needed on stock    -   Softer rims

As the occluder device does not have any threaded hub or clamp toprovide an attachment for a delivery system. The amount of materialimplanted in this area is reduced substantially, such as with over 70%by utilizing a specific welding process to form a ball specificallydesigned for compatibility with the delivery system.

Furthermore, producing a medical implant has been perfected by itsNitinol surface technology to obtain an extremely smooth and flexibleouter layer. A golden color of the implant has become synonymous withthe highest standard in biocompatibility without risking cracks ordeformations forming upon compression/expansion. The composition of thelayer is identical to what has been used in 100.000 of Nitinol medicalimplants with the added advantage of being more flexible.

The present invention has been described above with reference tospecific embodiments. However, other embodiments than the abovedescribed are equally possible within the scope of the invention. Thedifferent features and steps of the invention may be combined in othercombinations than those described. The scope of the invention is onlylimited by the appended patent claims.

What is claimed is:
 1. An intravascular delivery device comprising adelivery wire having a proximal and a distal end and an interior lumenextending therebetween and wherein said distal end comprises aconnection interface adapted to matingly interlock with a proximal endportion of a medical implantable device, wherein said delivery devicecomprises a locking unit arranged to secure said connection interface ina locking position in which said medical implant is pivotably lockedbefore a controlled release.
 2. The intravascular delivery deviceaccording to claim 1 comprising a locking wire arranged moveably withinthe lumen of said delivery wire for relative longitudinal movementtherein, said locking wire having a distal end comprising a holdingstructure whereby said holding structure is axially moveable relativesaid delivery wire between said locking position at which said deliverywire encloses said holding structure and a second position at which saidholding structure at least partly protrudes beyond said distal end ofsaid delivery wire such that said connection interface unlocks and saidmedical implantable device is controllably released.
 3. Theintravascular delivery device according to claim 1, wherein said medicalimplantable device is an occlusion device for occluding a selected sitein a body.
 4. The intravascular delivery device according to claim 1,wherein said connection interface holding said medical implantabledevice provides for an axial flexibility such that said medicalimplantable device may tilt relative the longitudinal axis of saiddelivery device.
 5. The intravascular delivery device according to claim1, wherein said holding structure is radially enlarged to at leastpartly contact the interior lumen of said distal end of said deliverywire.
 6. The intravascular delivery device according to claim 1, whereinthe distal part of said holding structure is bowl-shaped and has arecess in the edge of the bowl-shaped portion at the distal end of saidholding structure for receiving a portion of said medical implantabledevice.
 7. The intravascular delivery device according to claim 6,wherein said recess is configured to enclose said proximal end portionof said medical implantable device at least partly.
 8. The intravasculardelivery device according to claim 1 comprising a control deviceconnected to said proximal end of said delivery wire for controllablyunlocking of said connection interface.
 9. The intravascular deliverydevice according to claim 8, wherein said control device is secured whensaid holding structure is in said locking position such that saidcontrol device has to be manually operated to allow for said unlockingof said connection interface for controlled release of said medicalimplantable device from said delivery device.
 10. A medical implantabledevice having a proximal end portion adapted to matingly interlock withsaid connection interface of claim
 1. 11. A medical implantable devicecomprising a bundle of strands, said bundle of strands of said devicecomprising a welded end having a welded proximal end portion, whereinsaid welded proximal end portion has defined proportions and dimensionsconfigured as a connection interface adapted to matingly interlock witha holding structure.
 12. The medical implantable device according toclaim 10, wherein said connection interface has a generally sphericalshape.
 13. The medical implantable device according to claim 10, whereinsaid connection interface allows for pivotal movement when locked. 14.An assembly comprising: a delivery device according to claim 1 and amedical implantable device according to claim 10, arranged in a catheterfor intravascular delivery of said medical implantable device.
 15. Theassembly according to claim 14 for use with a catheter comprising: anintravascular delivery device comprising a delivery wire having aproximal and a distal end and an interior lumen extending therebetweenand wherein said distal end comprises a connection interface adapted tomatingly interlock with a proximal end portion of a medical implantabledevice, an internal wire extending within the lumen of said deliverywire which is controllable for relative longitudinal movement from saidproximal end of said delivery wire, said internal wire having a distalend that carries a holding structure wherein said holding structure isaxially moveable relative said delivery wire from a first position atwhich said delivery wire encloses said holding structure whereby saidconnection interface is adapted to matingly interlock with said proximalend portion of said medical implantable device to a second position atwhich said holding structure at least partly protrudes beyond saiddistal end of said delivery wire such that said connection interfaceunlocks and said medical implantable device is released; a controldevice connected to said proximal end of said delivery wire; a medicalimplantable device comprising a bundle of strands, said bundle ofstrands of said device comprising a welded end having a welded proximalend portion, wherein said welded proximal end portion has definedproportions and dimensions configured as a connection interface adaptedto matingly interlock with a holding structure, and; wherein saidmedical implantable device is extendable from a relaxed conditioncapable of assuming a convoluted condition, to an extended, linearcondition in which said medical implantable device can be advancedthrough the lumen of said catheter.